At the instant its angular displacement is $0\mathrm{.}32$ rad, the angular acceleration of a physical pendulum is $-630$ rad$/$s$2.$ What is its angular frequency of oscillation?Select answer from the options below$14$ rad$/$s $44$ rad$/$s $200$ rad$/$s $20$ rad$/$s $6\mathrm{.}6$ rad$/$s $$